Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1b030efb3805d8…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 01:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4ba2120d95ba464659300fbdeab5daf SHA-1: 7aa67cd9d08b37da8658bbb209b69c88a7d4c3f5 SHA-256: bc1b030efb3805d8d72a24c9412d08c177b50b1f92762ac075b40268f67590c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f9798d5a---pukolegosenixejopagite.pdf
    • http://promador.pl/userfiles/file/gatunakupusakosobarinixon.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6ddtll51mdc00cr9h37hbbfsb7/zijodewufurelogume.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9282dfdbf---wogenoferatinimonox.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1las7j442958fn5ctm7a9704dv/87898803070.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e262a1f739---tufiso.pdf
    • https://nnt52.ru/userfiles/file/waleja.pdf
    • http://lexus-custom.com/js/upload/files/waxowuzixe.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a00240d66a5---6517393205.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087760480315---rowagumalufum.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8240e76d8f9b09b4eed5a9d3d7fc8128/10845112712.pdf
    • https://ratsimae.ee/media/contents/file/95828273986.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a00c7c050d0b6f59bc2449b9e4af1feb/jopubizivatu.pdf
    • https://ratco-hardware.com/Ups/files/22233800921.pdf
    • https://hyosungulf.com/uploads/file/rozizite.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1bd4d12ffacb5d4b68cc366a5eabf2b2/42305166126.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098b742128f9---5663110050.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160896ed02604f---numipuwasowixoxagigimube.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/24300584475.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/92585442448.pdf
    • https://prosperitas.be/data/assets/file/51695819533.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e1b2004c70493ec4c62828de0281858d/vilapomeme.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=microbes+in+human+welfare+neet+questions+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b032c043777---81146306687.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a4.bin
d8652dedf425a16a77bf75eab3f5a18efe75788d335a4e858bc18429a4297069
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 11352 bytes
font_01_sfnt_off000111c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 16792 bytes
font_02_sfnt_off000129da.bin
959de7a103e83658d153cb91d4f3d1d1acab4815e035c0cb28e94b628c6421b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 16808 bytes